We know Stan's father was at the Casquets Lighthouse in the Channel Islands in 1927.

http://www.lighthouse-duo.net/Ball/FLK.htm

Even though what we have of his service records, is a bit scetchy, because Trinity House lost a lot of their documentation in bombing raids in 1940.
But we know about Dad being at Casquets, because we have a pair of paintings one of his fellow keepers painted and gave him as a present. The paintings are dedicated, signed and dated on the back.
Dad was involved in trials of radio communication from this lighthouse and he was always very proud of having done that.